Improvement in combined cocks and anti-concussion valves



Combined Cock and Anti- F.` VAN D UZER.

Cun'cussion Valve.

Patented July 6,1875.

fam/1M f UNITED S'rATEs PATENT OEEIGE.

vISAAC F. VAN DUZER.` OF MIDDLETOWN, ASSIGNOR TO CHARLES HARRISON,

OF NEW YORK, N. Y.

IMPROVEMENT IN COMBINED COCKS AND ANTI-CONCUSSION VALVES.

Specication forming partV of Letters Patent No. 165,190, dated July 6,1875; application n'led June 19, 1875.

To allrwhom t may concern:

Be it known that I, I. F. VAN DUZER, of

Middletown, Orange county, New York, have 'on its seat by a springpowerful enough to re sist the pressure of thewater when at rest, butnot powerful enough to resist the pressure which ensues when the water,having been in motion through the pipes, is suddenly arrested by theclosing ot' the valve or cock `through which it has been owing.

The accompanying drawings are as follows: Figure 1 is a longitudinalsection through the center of the valve shell and stem, showing theinduction and eduction passages, and showing the main valve open. Fig. 2is a similar view, showing' the main valve at the instant of closing,and the supplementary valve slightly elevated from its seat.

Referring' to the drawings, A represents the valve-shell 5 b, thevalve-stem, which is pressed upward by the spiral spring bl, andthusppulls the valve b2 up against the annular valve-seat a.

The valve is a iiat disk provided with a hol low bolt, c, upon which amale screw-thread is cut, which engages the female thread c on theinside of a hole bored in the lower end of the valve-stem. A shoulder,d, is formed on the inside o f the hollow bolt c, which engages one endotthe spiral spring c, which is wound around the supplementaryvalve-stem f, and expands against the collar fon the lower end ot' thesupplementary valve-stem. The upper end of the supplementary valve-stemis provided with a conical collar, g, the under surface of which engagesthe countersunk seat g', formed in the upper end of the hollow bolt c.

The spiralsprin g e is made stiff enough to hold the conical collar gdownupon its seat against the ordinary pressure ofthe water at rest; butwhen the valve is in the act of closing, and thereby suddenly' checkingthe momentum of the water, the spiral spring e yields, and a jet ot'water passes through the hollow bolt c into the cavity in the lower endof the valve-stem, and out therefrom through the lateral outlet h. Thestructure to which I have applied my supplementary valve is what isknown as a slow-closing7 or otherwise a variable, chamber-valve, theclosing of the main valve being regulated by the escape ot' water fromthe chamber i in the upper part of the valve. When the main valve isfully open, so as to withdraw the plug j from the variable cham.- berc', the variable chamber becomes filled with water, and in such case thevalve closes slowly; but ifthe valvestem is onlypartially depressed, sothat, although the main valve is open, there is no water admitted to thevariable chamber, the main valve will close suddenly if pressure isremoved from the valve-stem, and in that case my supplementary valveoperates to ease the closing of the main valve and prevent concussion byinjecting a small jet of water into r the chamber above the valve. Bythe gradual closing of the supplementary valve in obedience to theoperation of the spiral spring e the momentum of the current of water isgradually, instead of suddenly, checked.

I claim as my invention- .Y

In a cock for fluids, the combination of the main valve with asupplementary valve and a spring so graduated in strength as to hold thesupplementary valve upon its seat against the ordinary pressure of waterin a state ot rest, while yielding to allow the supplementary valve toopen when the main valve is suddenly closed.

I.V F. VAN DUZER.

Witnesses:

DANL. GoNvrN, U. T. HAYES.

